EP0656225A1 - Cartouche filtrante - Google Patents

Cartouche filtrante Download PDF

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Publication number
EP0656225A1
EP0656225A1 EP94113402A EP94113402A EP0656225A1 EP 0656225 A1 EP0656225 A1 EP 0656225A1 EP 94113402 A EP94113402 A EP 94113402A EP 94113402 A EP94113402 A EP 94113402A EP 0656225 A1 EP0656225 A1 EP 0656225A1
Authority
EP
European Patent Office
Prior art keywords
end part
bellows
filter cartridge
cartridge body
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94113402A
Other languages
German (de)
English (en)
Other versions
EP0656225B1 (fr
Inventor
Wolfgang Jander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Publication of EP0656225A1 publication Critical patent/EP0656225A1/fr
Application granted granted Critical
Publication of EP0656225B1 publication Critical patent/EP0656225B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4272—Special valve constructions adapted to filters or filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/79—Regeneration of the filtering material or filter elements inside the filter by liquid process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/04—Permanent measures for connecting different parts of the filter, e.g. welding, glueing or moulding

Definitions

  • the invention relates to a filter cartridge for dust separation, with a cartridge body, which consists of a support grid, a lower closed end part and an upper end part with a central outlet opening, and with a filter medium surrounding the support grid in the form of a pleated bellows, which is arranged in the form of a cylinder is, the upper and lower ends of the bellows are fixed dust-tight on the two end parts.
  • Filter cartridges have recently been used for the purposes of industrial dedusting.
  • the reason for this measure is, in particular, the larger filter area in comparison to known bag filters with the same construction volume of the filter systems, which leads to a reduction in the filter area load or enables a more compact design.
  • the known filter cartridges are also used for the recovery of dusts from a wide variety of process engineering processes, for example for the recovery of pharmaceutical dusts.
  • filter cartridges Another application for filter cartridges is the recovery of dusts from electrostatic powder coating systems. In the case of this application, the recovery of the powder coating used in the coating booths also determines the economy of the entire coating process.
  • filter cartridges Other areas of application for filter cartridges are the fluidized bed dryers, in which dusts are dried by swirling, and fluidized bed granulators, in which dusts are combined into pellets by means of swirling.
  • the filter medium or the bellows formed from it is attached to the two end parts, i.e. in the area of the bottom and the lid of the cartridge body, usually fixed and sealed by a casting resin.
  • the lower end part of the cartridge body is, for example, a round cup-shaped pressed part, the outer diameter of which corresponds to the outer diameter of the bellows.
  • filter cartridges are less easy to clean compared to filter bags. As a result, it can never be completely ruled out that residual dust from the old batch remains on the cartridges. This also means that the filter cartridges have to be replaced frequently and the system operator has to keep a corresponding reserve of such cartridges in stock.
  • the bottom thereof ie the lower end part
  • the filter cartridge With its upper firing part, the filter cartridge is fastened to a mounting base, the sealing to the mounting base using a plastic seal, for example a silicone seal.
  • the filter cartridge is flowed through from outside to inside during operation, ie the raw gas side is outside the filter cartridge and the clean gas space is connected to the inside of the filter cartridge via the outlet opening. During operation, the dust cake is deposited on the surface of the filter medium.
  • the cartridge After building up an appropriate thickness, the cartridge is cleaned, whereby the dust cake falls down and the residual dust in the dead corners of the Filter cartridges remain, which are formed by the ends of the bellows there together with the lower end part. A complete removal of this residual dust is not possible in normal cleaning operations. In other words, the cleanability of such a filter cartridge is unsatisfactory in practice.
  • the German utility model no. 91 13 531.1 a filter cartridge is known in which the lower end part, that is, the bottom of the filter cartridge, has an outline which corresponds to the bottom view of the bellows arranged in a cylinder.
  • the bottom of this filter cartridge has a serrated, star-shaped outline, the star-shaped contour corresponding to the course of the folds of the bellows.
  • this known filter cartridge is also not yet suitable for meeting the increased requirements with regard to its cleanability. Due to the fold contours present in the lower end region of the bellows, residual dust deposits can still form on the outer surfaces of these cross-sectional contours of the folds in such a way that these dust deposits cannot be completely removed during washing.
  • wash water penetrates but cannot get out is the pressure used during washing. This pushes the water through the membrane. Then there is a pressure drop on the inside.
  • the washing water contains surfactants that make the membrane hydrophilic.
  • product residues can be deposited on the outer surface of the lower bottom part of the filter cartridge during filtration, such product residues not being able to be removed again with the washing water which is intended for the folds of the bellows.
  • additional water has to be used to clean the underside of the cartridge, which increases the amount and costs of disposal.
  • an additional possibility must be created for the washing device in order to detect the bottom of the filter cartridge, which of course requires additional design effort.
  • the present invention has for its object to provide the development of an improved filter cartridge, which extremely good cleaning capabilities both inside and inside has the outer region of the cartridge body and in particular the "standing water” inside the filter cartridge is avoided.
  • any adhering dust can be completely removed in the course of the cleaning process with the aid of the washing water flowing off, i.e. as it were without residue.
  • the lower end part is at least partially conical, tapering in a direction starting from the cartridge body of the filter cartridge.
  • a conical design of the lower end part leads to the advantage that during the cleaning process the washing liquid can flow down very well on this conical surface, with the result that this surface is also cleaned very well. It is of course important to ensure that the cone angle of the conical lower end part is selected so that the cleaning liquid does not detach or drip from this surface before it has completely solved its cleaning task and has reached the lower cone tip.
  • a valve is arranged in the region of the cone tip of the lower end part, which enables the washing liquid which has penetrated into the interior of the cartridge body through the filter material to run off again to the outside.
  • the lower end part of the cartridge body has a substantially conical shape, but it has a short cylindrical section in the axial direction upwards which projects into the lower opening of the cartridge body and which serves both with the lower end of the bellows the lower end to fix and seal, as well as to firmly connect the lower end of the support grid to the lower end part.
  • the substantially cylindrical support grid has a smaller diameter than the axial section of the lower end part, so that the support grid is introduced into the region of the inner circumference of the lower end part, more precisely, into the region of the inner circumference of its short cylindrical section and is fastened there with it can. Such attachment can be done in particular by riveting or welding.
  • This connection area is preferably located between the lower end of the support grid and the inner circumference of the lower end part within the sealing compound, which at the same time forms a mechanical connection between the support grid and the lower end of the bellows in the area of its web ring.
  • the upper end of the bellows is fixed and sealed in the upper end part of the cartridge body in a manner known per se by means of potting compound.
  • the filter cartridge used for dust separation is generally designated by the reference number 20.
  • This filter cartridge 20 is essentially composed of a cartridge body 1 and a filter medium in the form of a pleated bellows 3.
  • the cartridge body 1 in turn consists essentially of a support grid 2, a lower closed end part 9 and an upper end part 8, in which a central outlet opening 6 is provided.
  • the cylindrical, openwork support grid 2, the lower end part 9 and the upper end part 8 are connected to one another with the aid of mechanical fastening means, for example by mutual riveting or welding, whereby a cartridge body 1 is formed, which gives the resulting filter cartridge 20 the required stability.
  • the pleated bellows 3 (see also FIG. 4) is also arranged in the shape of a cylinder which surrounds the support grid 2. Basically, the lower end of the bellows 3 is fixed and sealed to the lower end part 9 of the cartridge body 1 by means of a casting compound 4 (casting resin, eg PUR), while on the other hand the upper end of the bellows 3 is correspondingly in the upper end part 8 of the cartridge body 1 is fixed and sealed by means of such a sealing compound 5.
  • a casting compound 4 casting resin, eg PUR
  • the upper end part 8 is used to attach the complete filter cartridge 20 to a mounting base (not shown).
  • the filter cartridge 20 is flowed through from the outside in, i.e. the raw gas side is located outside the filter cartridge 20, while the clean gas space communicates with the interior of the filter cartridge 20 via the upper outlet opening 6.
  • the filter medium of the filter cartridge 20 is formed by a pleated bellows 3, the basic design of which can be seen in FIG. 4.
  • the individual folds of the bellows 3 each have two mutually associated legs 3, and 3 ′′. in the In the basic state, these folds run over the total height of the cylindrical bellows 3.
  • the folds of the bellows 3 in the vicinity of the bottom of the cartridge body 1 are tightly closed in such a way that webs 11 projecting radially outward from the jacket of the bellows 3 are formed (cf. 1 and 2) which, as it were in the form of a web ring 12, surround an axial section 13 of the lower end part 9 of the cartridge body 1, which is essentially conical in the present exemplary embodiment.
  • the lower end part 9 is substantially conical for reasons to be explained further below, in which it is located in a away from the cartridge body 1, i. tapered downward direction.
  • the lower end part 9 is in the form of a round central body which fills the lower opening of the cartridge body 1 , so that in the case of such an embodiment the lower end part 9 is completely surrounded by the web ring 12 of the bellows 3.
  • two mutually associated legs 3 'and 3''of the folds of the bellows 3 are firmly connected to one another, for example glued to one another or welded.
  • these webs 11 then surround the lower end part 9 or at least the axial section 13 of this end part 9 in a ring shape, ie in the form of the above-mentioned web ring 12, as shown in particular in FIG. 2.
  • the lower end part 9 of the cartridge body 1 is designed, ie either in the form of a round central body or in the form of a conical body, as shown in FIG. 1, the bellows is in the region of its web rim 12 by means of casting compound 4 on the Cartridge body 1 fixed and sealed.
  • Such sealing the lower end of the bellows 3 is carried out in practice, for example, so that a cylindrical auxiliary body is first inserted into the cartridge body 1, which has a slightly smaller diameter than the outer diameter of the conical lower end part 9.
  • This cylindrical auxiliary body is inserted into the cartridge body 1 until it rests on the inner surface of the conical lower end part 9.
  • the cylindrical auxiliary body seals to the lower end part to a sufficient extent and prevents the potting compound to be subsequently introduced from flowing downward on the inside of the conical lower end part 9.
  • the gap between the cylindrical auxiliary body and the lower end of the bellows 3 can be filled with the sealing compound 4.
  • the cylindrical auxiliary body can be pulled out of the cartridge body 1 again upwards. In this way it is achieved that the lower end of the bellows 3 is connected gas-tight to the cartridge body 1 in the region of its web rim 12.
  • the support grid 2 has a smaller diameter than the axial section 13 of the lower end part 9 of the cartridge body 1.
  • a lower end portion of the support grid 2 is in the region of the inner circumference of the lower end part 9, in the present Trap in the area of the inner circumference of the axial section 13 of the end part 9, firmly connected to it with the aid of suitable fastening elements 15, for example by means of rivets or the like.
  • suitable fastening elements for example by means of rivets or the like.
  • fastening by means of welding can also be provided.
  • the resulting connection area is located within the casting compound 4, which overall also forms a mechanical connection between the support grid 2 and the lower end of the bellows 3.
  • the filter material is easier to remove from the cartridge at the bottom than at the top.
  • the potting compound e.g. is about 1 - 2 mm high and the adhesive is only pressed against the surface of the material.
  • the top it is e.g. 6 - 7 mm potting compound and the potting compound, in contrast to the bottom, can wrap around each side of each fold, i.e. it runs into folds and thus has more contact area.
  • the filter material is slit lengthways with a knife. At the top, the material is then torn away from the cartridge body with a knife. At the bottom, it loosens itself. The remainder left on the upper edge is detached from the cartridge body by heating.
  • the filter cartridges are cleaned overall from time to time by means of a corresponding cleaning liquid, such cleaning or washing being carried out within the corresponding filter system, i.e. when the filter cartridges 20 are installed (cf. also FIG. 5).
  • the cleaning liquid is fed through appropriate nozzles 7 (see FIG. 1) in the upper region of a cartridge body 1 in such a way that its entire circumference is cleaned of the adhering dust.
  • the supplied washing water thus flows along the surfaces of the folds of the bellows 3 in the direction from the upper end part 8 to the lower end part 9, and because of the design of the bellows 3 as described above it is ensured that in particular in the region of the lower web ring 12 of the bellows 3 adhering residual dust is completely removed with the aid of the cleaning liquid flowing downwards on the surface of the bellows 3. Due to the conical shape of the lower end part 9, it is further ensured that the cleaning liquid flows downwards on the outer cone surface of the lower end part 9 and can thus clean this surface well.
  • a valve 10 is arranged in the region of the cone tip of the lower end part 9. With the help of such a valve 10 it is possible that the washing liquid which has penetrated into the interior of the cartridge body 1 through the filter medium of the bellows 3 during the washing process can run down again.
  • This valve 10 is expediently chosen so that it is insensitive to dust, that it is closed in the event of negative pressure in the filter cartridge 20 (filtration) and that it also opens when there is excess pressure in the filter cartridge (cleaning pulse, water column). In addition, care is taken to ensure that this valve 10 also withstands the thermal and chemical loads which occur during operation of the filter cartridge.
  • FIG. 5 schematically shows a fluidized bed granulator in which there are, for example, tablets which are whirled up by an air stream (not shown) introduced into a container 16 from below.
  • a spray arm 17 for sugar solutions In the middle of the container 16 there is a spray arm 17 for sugar solutions, with which the tablets whirled up in the container 16 are evenly covered with a layer of sugar.
  • the container 16 is closed at the top by a mounting plate 18 in which a number of filter cartridges 20 are inserted.
  • the tablet dust resulting from abrasion collects on the outer surface of the filter medium of the filter cartridges 20 and falls down during cleaning, where it is collected and, if necessary, used for further use.
  • the filter cartridges 20 can of course be used equally in all other dedusting systems, but the use is particularly advantageous where absolute cleanliness is important, i.e. especially in the pharmaceutical and food industries.
EP94113402A 1993-10-28 1994-08-26 Cartouche filtrante Expired - Lifetime EP0656225B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4336870 1993-10-28
DE4336870A DE4336870C2 (de) 1993-10-28 1993-10-28 Filterpatrone

Publications (2)

Publication Number Publication Date
EP0656225A1 true EP0656225A1 (fr) 1995-06-07
EP0656225B1 EP0656225B1 (fr) 1998-01-21

Family

ID=6501284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113402A Expired - Lifetime EP0656225B1 (fr) 1993-10-28 1994-08-26 Cartouche filtrante

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EP (1) EP0656225B1 (fr)
DE (2) DE4336870C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112337227A (zh) * 2020-09-22 2021-02-09 长沙普罗科环境装备有限责任公司 清扫车的过滤除尘装置及干式扫路车

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19712679A1 (de) * 1997-03-26 1998-10-01 Mann & Hummel Filter Luftfilter
US8893895B2 (en) 2012-08-07 2014-11-25 Freund-Vector Corporation Cartridge filter assembly
CN108635978B (zh) * 2018-06-11 2020-09-15 台州学院 一种车轮净化器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206182A1 (fr) * 1985-06-15 1986-12-30 Kabushiki Kaisha Tsuchiya Seisakusho Filtre à fluide avec un milieu filtrant plié
DE9108022U1 (fr) * 1990-07-23 1991-09-05 Electrostar Schoettle Gmbh & Co, 7313 Reichenbach, De

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1837397U (de) * 1961-06-22 1961-09-07 Auergesellschaft Gmbh Hochleistungsfilter zum zurueckhalten von feinstaeuben, insbesondere radioaktiven feinstaeuben.
DE9113531U1 (fr) * 1991-10-30 1991-12-19 W.L. Gore & Associates Gmbh, 8011 Putzbrunn, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206182A1 (fr) * 1985-06-15 1986-12-30 Kabushiki Kaisha Tsuchiya Seisakusho Filtre à fluide avec un milieu filtrant plié
DE9108022U1 (fr) * 1990-07-23 1991-09-05 Electrostar Schoettle Gmbh & Co, 7313 Reichenbach, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112337227A (zh) * 2020-09-22 2021-02-09 长沙普罗科环境装备有限责任公司 清扫车的过滤除尘装置及干式扫路车

Also Published As

Publication number Publication date
DE59405092D1 (de) 1998-02-26
DE4336870C2 (de) 1997-02-27
EP0656225B1 (fr) 1998-01-21
DE4336870A1 (de) 1995-05-04

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